Heidi Klum believes in letting out her wild side in between the sheets.

"It's good to make an effort to dress up sometimes – to do things outside of the norm," the fashion mogul, who is currently courting bodyguard Martin Kirsten, tells Marie Claire in its February issue.

"Some people are more experimental in bed and others are more boring. If you are wild and crazy, bring it on so the other person is well aware that you have little devil horns that come out every once in a while."

Heidi Klum has so far been successful in passing down strong sense of style to her children.

"We have a rule in the house," the supermodel recently told reporters during a conference call. "Rule No. 1 is always to look cool, and rule No. 2 is don't forget about rule No. 1. We have other rules ... but the No. 1 rule is to always look cool."

Of her four kids – Leni, 8, Henry, 6½, Johan, 5½, and Lou, 2½ – the first two take the rule "very seriously," Klum says. "Henry changes clothes 10 times a day and he wants to be very cool. I mean, he would wear a T-shirt and then he will wear a tie just around his neck, knotted, and then a belt over the shirt."

The actress, who on Friday filed for divorce from her husband of five years, Tom Cruise, kept her previously scheduled Monday appearance on the Lifetime reality fashion competition Project Runway: All Stars, PEOPLE has learned.

And according to judge Isaac Mizrahi, Holmes, who appeared as a guest judge, was a nice addition to the show. "She did great," he told PEOPLE after the taping.

Thursday's Project Runway All Stars finale was its own animal: designers had just four days to create a six-piece collection, shown to a fashionable crowd at New York's Gotham Hall. No extra time, no New York Fashion Week – and no Tim Gunn.

But the finalists – Austin Scarlett, Michael Costello and Mondo Guerra – pulled it off, each presenting a polished mini-collection that showcased their personalities.